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Investments Accounted for Using Equity Method - Summary of Financial Information of Investments in Associates (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2020
TWD ($)
Condensed Financial Statements Captions [Line Items]            
Assets $ 523,741   $ 522,996   $ 17,105  
Liabilities (131,022)   (131,467)   (4,279)  
Total equity 392,719   391,529 $ 389,130 12,826 $ 387,273
Investments accounted for using equity method 8,252   6,949   $ 269  
Net loss for the period 38,061 $ 1,243 37,869 37,047    
Other comprehensive income (loss) 669 22 1,112 (966)    
TOTAL COMPREHENSIVE INCOME 38,730 $ 1,265 38,981 36,081    
Next Commercial Bank Co., Ltd. ("NCB") [Member]            
Condensed Financial Statements Captions [Line Items]            
Assets 37,431   33,540      
Liabilities (28,084)   (25,882)      
Total equity $ 9,347   $ 7,658      
Percentage of ownership in associates 46.26%   41.90%   46.26%  
Equity attributable to the Company $ 4,324   $ 3,209      
Unrealized gain or loss from downstream transactions (31)   (36)      
Investments accounted for using equity method 4,293   3,173      
Net Revenues (losses) 10   (47) 15    
Net loss for the period (969)   (1,004) (446)    
Other comprehensive income (loss) 14   (10) 0    
TOTAL COMPREHENSIVE INCOME $ (955)   $ (1,014) $ (446)